Doorbell and burglar alarm



G. LATCHEM.

DOORBELIL AND BURGLAR ALARM.

APPLICATION FlLED-DEC.23, 1921.

Patented June 27, 1922.

2 SHEETS-SHEET G.LATCHEM. vDOORBELL AND BURGLAR ALARM.

APPLICATION FILED DEC.23, 1921.

Patented June 27, 1922.

2 SHEETSSHEET 2.

6 Norway,

GEORGE LATCHEI/E, ,OE MARKED TIRIEE, ARKANSAS.

. noolterinr AND {sc ema ALARM.

Specificationof Letters Patent. p te m gi 1922 Application filedDecember 23, 1921. Serial No; 524,484.

. T all whom 'vlt'may concern:

Be it known that I, Gnoneu. ,LArroHnM, ;a' citizen of the United States,residing at Marked Tree, in the county of Poin'sett and State ofArkansas, have invented a new and useful Doorbell and Burglar Alarm, ofwhich the following is a specification.

This invention aims to provide a device which may be usedeit-her as adoor hell or as a burglar :alarm, and the invention aims, especially,toprovide {novel means (for operating and controllin'grthe movement ofthe striker.

It is within "the province of the disclosure to improve generally and toenhance {the utility of devices of that type to which the inventionappertains.

Zithzthe above and other 1 obj eots in view, which will appear as thedescription ;proceeds, the invention resides in :the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, ittbe'ing understood that, with in the scopeofwhat .is claimed, .changes in the precise embodiment of the inventionshown can be made Without departingfrom the spirit of the invention.

In the accompanying drawings;

Figure 1 shows-.inrelevation, a device-constructed in accordance withthe invention; Figure '2 is a vertical sectional view .wherein manyparts appear in elevation; Figure 3 is a section, the view being inthenature of an elevation Whereinparts are :removed;

Figure 4: is a section on the line l-4: of Figure 8; Figure 5 is asection :OIlithG iline 55 of Figure 3; and Figure 6 is:an elevationshowing the means .whereby the plunger or operating member is mountedand. controlled.

The numeral 21 marks a support, which may bea door, a door frame oranything of the sort, provided with an opening 2,

which, preferably, is in the .formota ,restricted slot as shown inzEigure '6. The numeral 5 denotes a fran1e, -tl1e itrame being acomposite structure, and including a base plate :3 secured at 14: to thesupport 1.

The'base plate 3'hasan opening registering with theopening 2 inthesupport 1. [A

back plate 6 is attached to the base plateS and is disposed parallel toafront plate .7,

the backplate'6having posts 8 whereonthe front plate 7 is mountedremovably, .as

A winding shaft 10 is journaled iforirotation in the franie 5 andisprovided with a squared forward :end 11 adapted for the reception of awrench .or'key. vAgearwheel 12 .is loose on the winding shaftnO. Apgtchet wheel 141s fiXedto the winding shaft wheel 14 and is pivoted tothe gear wheel 12, the gearwheel carrying. a spring. 16-

which, cooperating with the .pawl 15,, constrarns the pawl itO lcoact with the ratchet A pawl 15 cooperates with the ratchet w el 1&- 1 61 11 18 33 11.7 d sign-ates a coiled d iving spring; one end of which isattachedto one ofthe posts 8,:theqother end of the drivingflspring:beinggconnected to the'winding shaft 10. The pawland ratchetmechanism =ll l5rforms' a connection between 13116 gear wheel l2q and:the shaft 310;, whereby thegshaft 10 may be'rotated, to ;put the spring17 under tension, without rotating the gear wheel 12, the -foregoingbeing a common cloclcdetail, not worthy of specific delineation orextended description.

The gear wheel :12 m shes into a lan rn pinion 18 secured to a secondshaft 19 journaled in the frame ,5, theshaft 19.ca1n-,ying a :sto wheel20 having oppositely disposed long teethi2l and any desired nu nber 0t.interme ia e shert [teeth 2 st king wheel 23 is securedrto the-secondshaft. 19 and cooperates wit a finger 24 on a shaf 25 :mounted :to rockin theftranie .5, zthe shagft 25 carrying 1a striker 26 adapted gtovcoact with an audible signal, such as a bell 27, carried by aE'brac'ket -28 secured ,ajt -30 to theback plate 6.-

fllhe device inoludesa spring ;latcl1:29 secured at 81, at itsupperiend, to the back plate 6 and provided at its lower end withafoot-32. A notch :is formedin the foot.32, and, as shown in Figure 5,the notch produces, in the ,foot, a shoulder 33 and a shoulder 3.4L,theshoulder 34 -,project;ing beyondtheshoulder 33.

A {lever or adjusting member .35.;isdu1- crumed intermediate ,itsends,,-.as shown at 36, on the ,basepjlate; 3 and is supplied-at one endwith aw Wedge-shapedhead 37 adaptedito enter behind the spring latch29,,{the latch 29 .beingsprung away from the base plate 3 (Figure 2)more or less, depending on the amountthat the head37 .is introducedbehind the latch. ,At its lowerend, the lever the device is to-beused'as a;b-urglar-alarm,

a flexible element 39, or other connection,

(Figure 1) may be attached to the finger piece 38. The operation of thepart 39 will be explained hereinafter, since it is a more or lessincidental feature.

The numeral 40 marks an operating member, in the form of a plunger,mounted for longitudinal reciprocation in the opening 2 of the support 1and in the opening 60 of the base plate 3. The openings 60 and 2 arelarge enough so that the plunger 40 may have a transverse movement, aswell as a longitudinal movement. The inner end of the plunger 40 isadapted tocooperate with the foot 32 of the spring latch 29, to springthe latch outwardly, away from the base plate (compare Figures 2 and 5).Adjacent to its inner end, the plunger 40 has an inclined surface 41.

A disk 42 is-secured at 62 to the outer surface of the support 1 and hasan enlarged opening 43 shown in Figure 6, the outer end of the plungeror operating member 40 passing through this opening. A spring arm 44 isconnected by a securing element 45 to the support 1, the disk 42 havinga notch 46 giving access to the securing element. The spring arm 44extends beneath the plunger 40 and holds the plunger up, in the positionshown in Figure 2 for longitudinal sliding movement, in contact with thesupport 1, at the upper edge of the opening 2. The spring arm 44,however, is adapted to yield, to permit the plunger 40 to movetransversely and downwardly, under conditions which will be set forthhereinafter. Adjacent to its outer end, the plunger 40 is connected at47 to a spiral spring 48 attached at 49 to the disk 42, the spring andthe disk being located within a shell 50 mounted at 51 on the support 1.A push button 52 is mounted to slide in the shell 50 and engages theouter end of the plunger 40, the push button having a flange 53, which,cooperating with the shell 50, limits the outward movement of the pushbutton under the action of the spring 48 on the plunger 40.

The spring 17 imparts rotation to the winding shaft 10, the shaft 10driving the shaft 19 by way of the gear wheel 12 and the lantern pinion13. When the shaft 19 is rotated, the striking wheel 23, coacting withthe finger 24 on the shaft 25, imparts oscillating movement to the shaft25, the striker 26 moving into and out of engagement with the bell orsignal 27 in a way which will be understood readily by those skilled inthe art.

When the button 52 is pressed inwardly, the spring 48 is compressed, andthe plunger 40 moves inwardly. The plunger 40 moving inwardly, engagesthe foot 32 of the spring latch 29 and moves the spring latch out ofengagement with the stop wheel 20 whereby permitting the mechanism tooperate. After the plunger 40 has been advanced a. predetermined amount,the inner end of the plunger slips off the foot 32 of the latch 29, and,thereafter, the latch 29 springs to the left (Figure 2) into engagementwith the stop wheel 20, the mechanism being brought to a stand still,and it being impossible for the bell 27 to continue to ring, even thoughthe operator may hold his finger on the button 52. When pressure on thebutton 52 is relieved, the button and the plunger 40 move outwardly,under the action of the spring 48. Owing to the fact that the plunger 40is beveled as shown at 41, the latch 29 may spring to the left (Figure2) as aforesaid and engage with the stop wheel 20.

There are three possible ways in which the device may be operated.First, it ma be caused to operate continuously, that is, the bell 27 maybe permitted to sound until the spring 16 is in a neutral position.Secondly, a relatively long ring, but not a continuous ring may beproduced. Third, a short ring, perhaps not more than a single tap mayresult. If head 37 of the lever 35 be introduced but a little way behindthe latch 29, any of the teeth 21 or 22 of the latch 29 will be engagedby the shoulder 34 on the foot 32 of the latch 29, then the inner end ofthe plunger slips off the foot 32, and then the latch 29 swings to theleft (Figure 2) as hereinbefore explained. If the head 37 of the lever35 is introduced still further beneath the latch 29, then, the shoulder34 will cooperate with the long teeth 21 of the stop wheel 20 and thewheel 20 will be permitted to make a half revolution, a longer ringresulting than is produced when the shoulder 33 is permitted to engageany of the teeth 21 or 22 of the stop wheel 20. Finally, the head 37 ofthe lever 35 may be introduced so far behind the latch 29 as to holdboth of the shoulders 34 and 33 out of the path of the teeth 2122 on thestop wheel 20, whereupon the bell 27 will sound continuously until thespring 17 has run down. This last 110 operation results only when thelever 35 is operated by the flexible element or connection 39. Theconnection 39 is adapted to be attached to a remote door, a window orthe like, and it is obvious that when the door 115 or window is opened,the bell 27 will sound continuously, the device thus being used as aburglar alarm.

Having thus described the invention, what is claimed is:

1. In a device of the class described, a striker; a driving trainoperating the striker and including a stop wheel; a latch cooperatingwith the stop wheel; a movable adjusting member under the control of anoperator 125 and cooperating with the latch to vary the position of thelatch with respect to the stop wheel; and means under the control of anoperator for disengaging the latch from the stop wheel. 3

2. In a device of the class described, a of an operator for disengagingthe latch striker; a driving train operating the striker and including astop wheel having long teeth and short teeth; a latch having a'shoulderadapted to cooperate with the long teeth and provided with a shoulderadapted to cooperate with all of the teeth; an adjusting member coactingwith the latch to dispose either of the shoulders in operative relationto the proper teeth of the stop wheel; and means under the control of anoperator for disengaging the latch from the stop wheel.

3. In a device of the class described, a striker; a driving trainoperating the striker and including a stop wheel having long teeth andshort teeth; a latch having a shoulder adapted to cooperate with thelong teeth and provided with a shoulder adapted to cooperate with all ofthe teeth; an adjusting member coacting with the latch to positioneither shoulder for engagement with the proper teeth, and coacting withthe latch to hold the latch completely out of engagement with the stopwheel; and means under the control from the stop wheel.

42. In a device of the class described, a striker; a driving trainoperating the striker and including a stop wheel; a latch cooperatingwith the stop wheel; an adjusting member coacting with the latch to varythe position of the latch with respect to the stop wheel; a plungerengaging the latch; and

means for mounting the plunger for longitudinal movement, whereby theplunger will disengage the latch from the stop wheel, and for mountingthe plunger for transverse movement, whereby the latch will slip ofl theplunger, after the plunger has been advanced a predetermined amount.

In testimony that I claim the foregoing as my own,I have hereto afiixedmy signature in the presence of two witnesses.

GEORGE LATCHEM.

